Cargando…

Tests and deflection calculation method for circular concrete-filled steel tubular columns under very low-elevation lateral impact loads

An experimental investigation of circular concrete-filled steel tubular (CFST) columns subjected to very low-elevation lateral impacts was performed. Six circular CFST members were prepared for lateral impact tests according to the typical CFST columns in high-speed railway stations in China, and th...

Descripción completa

Detalles Bibliográficos
Autores principales: Liang, Jiayu, Liu, Yanhui, Zhao, Yichao, Xu, Nan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10643663/
https://www.ncbi.nlm.nih.gov/pubmed/37957220
http://dx.doi.org/10.1038/s41598-023-47103-x
_version_ 1785147147432230912
author Liang, Jiayu
Liu, Yanhui
Zhao, Yichao
Xu, Nan
author_facet Liang, Jiayu
Liu, Yanhui
Zhao, Yichao
Xu, Nan
author_sort Liang, Jiayu
collection PubMed
description An experimental investigation of circular concrete-filled steel tubular (CFST) columns subjected to very low-elevation lateral impacts was performed. Six circular CFST members were prepared for lateral impact tests according to the typical CFST columns in high-speed railway stations in China, and the impact location was at the height of the 2/9 column. The tests had three variables: the thickness of the steel tube, the impact velocity, and the axial load. The failure modes were determined in the tests, along with the time histories of the impact force and the deflection at the impact location. A finite-element analysis was performed to examine the effects of the axial load and scaling on the maximum deflection. The results show that with the increase of axial compression ratio, the impact resistance of the member first increases and then weakens. According to the travelling plastic hinge theory, a three-stage rigid plastic mechanical model was employed to describe the impact process, in which the impact location was at the non-mid-span, and a deflection calculation method for CFST applicable to any impact position was developed. A comparison with the test results indicated that deflections can be calculated with reasonable accuracy using the proposed method.
format Online
Article
Text
id pubmed-10643663
institution National Center for Biotechnology Information
language English
publishDate 2023
publisher Nature Publishing Group UK
record_format MEDLINE/PubMed
spelling pubmed-106436632023-11-13 Tests and deflection calculation method for circular concrete-filled steel tubular columns under very low-elevation lateral impact loads Liang, Jiayu Liu, Yanhui Zhao, Yichao Xu, Nan Sci Rep Article An experimental investigation of circular concrete-filled steel tubular (CFST) columns subjected to very low-elevation lateral impacts was performed. Six circular CFST members were prepared for lateral impact tests according to the typical CFST columns in high-speed railway stations in China, and the impact location was at the height of the 2/9 column. The tests had three variables: the thickness of the steel tube, the impact velocity, and the axial load. The failure modes were determined in the tests, along with the time histories of the impact force and the deflection at the impact location. A finite-element analysis was performed to examine the effects of the axial load and scaling on the maximum deflection. The results show that with the increase of axial compression ratio, the impact resistance of the member first increases and then weakens. According to the travelling plastic hinge theory, a three-stage rigid plastic mechanical model was employed to describe the impact process, in which the impact location was at the non-mid-span, and a deflection calculation method for CFST applicable to any impact position was developed. A comparison with the test results indicated that deflections can be calculated with reasonable accuracy using the proposed method. Nature Publishing Group UK 2023-11-13 /pmc/articles/PMC10643663/ /pubmed/37957220 http://dx.doi.org/10.1038/s41598-023-47103-x Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Liang, Jiayu
Liu, Yanhui
Zhao, Yichao
Xu, Nan
Tests and deflection calculation method for circular concrete-filled steel tubular columns under very low-elevation lateral impact loads
title Tests and deflection calculation method for circular concrete-filled steel tubular columns under very low-elevation lateral impact loads
title_full Tests and deflection calculation method for circular concrete-filled steel tubular columns under very low-elevation lateral impact loads
title_fullStr Tests and deflection calculation method for circular concrete-filled steel tubular columns under very low-elevation lateral impact loads
title_full_unstemmed Tests and deflection calculation method for circular concrete-filled steel tubular columns under very low-elevation lateral impact loads
title_short Tests and deflection calculation method for circular concrete-filled steel tubular columns under very low-elevation lateral impact loads
title_sort tests and deflection calculation method for circular concrete-filled steel tubular columns under very low-elevation lateral impact loads
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10643663/
https://www.ncbi.nlm.nih.gov/pubmed/37957220
http://dx.doi.org/10.1038/s41598-023-47103-x
work_keys_str_mv AT liangjiayu testsanddeflectioncalculationmethodforcircularconcretefilledsteeltubularcolumnsunderverylowelevationlateralimpactloads
AT liuyanhui testsanddeflectioncalculationmethodforcircularconcretefilledsteeltubularcolumnsunderverylowelevationlateralimpactloads
AT zhaoyichao testsanddeflectioncalculationmethodforcircularconcretefilledsteeltubularcolumnsunderverylowelevationlateralimpactloads
AT xunan testsanddeflectioncalculationmethodforcircularconcretefilledsteeltubularcolumnsunderverylowelevationlateralimpactloads